Took advantage of clear sky, despite 17*F temperature, to do a shoot out of the two UO 16mm flat-top Konigs. The one on the left is the later, probably NS, and the one on the right is the Pro series.
Used the C14 on Jupiter (244X). Some turbulence but good moments of seeing. Both eyepieces showed wonderful detail all the way to the poles, multiple ovals, barges, texture between the EBs, and curlicues on one EB. Every time I thought I could see more detail in one, a switch revealed the same in the other. The Pro did seem just a bit warmer in color.
Moving to M42, E and F were clear as day in the Pro version, which seemed just a bit brighter than the NS. But they were also clear in it.
On the moon, the multi coatings of the NS showed their advantage, with a clearly darker background just off the terminator. But I didn't see any difference in the detail they revealed. Both showed some field curvature
Then over to Mars, which was quite bright, so that Hellas Planitia looked like another polar cap. The actual pole was very prominent, and a dark V was visible above Hellas. But it was low and swimming in waves of air.
For fun, I put a 3mm DeLite in the 6"f9 (457X) and Mars really came to life as a three dimensional orb, with more detail visible in the dark areas, the pole more clearly defined, and Hellas Planitia becoming an obvious oval. Not nearly as disturbed by the turbulence. It reminded me why I love this old AP refractor.
Chip W.